Method of tamping and tamping machine



,- April 12,1927. 1,624,734

c. R. HUNT METHOD OF TAMPING AND TAMPING MACHINE I File'd Aug. 2, I926'2 Sheets-Sheet 1 I N VEN TOR 64/1 07 flaw- A TTORNEY ril 12 1927.- v APc. R. HUNT METHOD OF TAMPING AND TAMPING MACHIN E Filed Aug. 2, 1926 aSheec-Sheecfi 1N VEN TOR 64/1 6/2 /1? 70/77.

ATTORNEY Patented Apr. 12,

CALVERT R. HUNT, or Ramses CITY, MISSOURI.

METHOD OF TAMIING AND TAMPING MACHINE.

Application filed Angus-t 2, 1926. Serial No. 126,442.

My invention relates to a method of building a .road, and the apparatusfor accom- 'pl ishing such method, and more particularly to a new andimproved method of tmping a road and the tamping machine, the presentapplication being a continuation in part of my application filed March13, 1922, Serial No. 543,281.

It is a purpose of my invention to provide new and improved means fortamping a roadway, comprising a plurality of members having projectionsthereon adapted to be rolled over thesurface of the roadway to .tamp'and knead a binder into the same,

said projections being arranged in a plurality of circular series andthe projections being staggered transversely of the rotatable means.

. her having a series of projections thereon It is a furtherpurpose ofmy invention to provide anew and improved road tamping and kneadingdevice comprising rotatable means mounted at one end of a framework, apower unit mounted on the framework, and new and improved means forconnecting the front axle with the power unit and with the framework toprovide a substantially three point support for the power unit.

,It is a further purpose of my invention a to provide a new and improvedmethod of tamping and kneading a surface such as a roadway, comprisingthe rolling of a mem over said surface and then-rolling a member havinga series of projections of a different shape over the same surface. Theob ject of doing this is to avoid the sinking of the projections of onerotatable member in the recessesmade in the roadway by the projec'tionsof a preceding rotatable member as would be the case if the projectionswere all of the-same shape. This may be accomplished by providingprojections of different shapes on the same machine or providingprojections of one shape on one machine and of a different shape onanother machine so that when said machines follow each other, theprojections on the following machine .will not enter the recesses madebythe projections on the preceding machine. In the fcase where differentsized and shaped projections are provided on the same machine,"

the machines are staggered so-th at they do not exactly. follow in thesame track, thus placing the similar projections on the variousmachinesout of alignment.

It is a further purpose of the invention to provide a machine of theabove mentioned character that can be moved back and forth over thesurface to be operated on without turning the machine around.

Other objects and advantages of the invention will appear as thedescription of the accompanying drawings proceeds. However, I desire tohave it distinctly understood that I do not intend to limit myself tothe exact details shown or described, but that I intend to include aspart of my invention all such obvious changes and modifications of'partsas would occur to a person skilled in this art and as would fall withinthe scope of the claims.

Fig. 4 is a transverse vertical sectionalview through the groundengaging tamping element, and I j I Fig. 5 is a perspective view-of thefront axle engaging yoke member.

Referring'in detail to the drawings: My improved road tamping devicecomprises a power unit 10 of a well known type and a frame member havingthe longitudinally extending members 11 provided with the substantiallyparallel end portions 12 and 13 andthe obliquely extending portions 14connecting the portions 12 and 13, thus providing a frame work thatisrelatively wide at one end thereof and relativelynarrow at the other endthereof. The longitudinally extending members 11 are connected at theirrear. ends by. means of the cross member 15 and at the front endsthereof by means of a yoke-like member formed by .a pair of transverselyextending bars 17 having. flattened ends 18 which are secured to theparallel portions 12 'of the members 11.

The transversely extending members 17 are depressed in the centerthereof, inclining downwardly from the opposite sides toward the centerand are provided with aligning openings 19. .The aligning openings 19furthermore align withthe opening 20 in the ear 21 depending from thepower unit 10 and with an opening 22 in the front axle Q3. A- pivot pin24: in the form of a bolt- -like member extends through the openings19., 20 and 22, pivotally securing the power unit 10, the front axle 23and the forward end of the frame together.

clamping the rear axle housing 31 of the power unit 10 to the framework.The power unit is provided with the usual steering wheel 32 which steersthe front wheels 33 mounted on, the axle 23 in the usual manner and isfurthermore provided with the usual drivers seat 34. A

The power unit. 10

drives suitab.e axles in the axle housing v31 in the usual manner,

have substantially: flat end portions, the prosprocket" wheels 35 beingprovided on the outer ends of said ,axles over which the sprocket chains36 operate, said sprocket chains 36, passing over vthe sprockets 37keyed to the shaft 38. Said shaft 38 is jourhalled in;bearing blocks 39which are adjustably mounted on the parallel portions 13 of thelongitudinally extending members 11 ofthe framework.- The bearingmembers 39 are adjustable by means of the set screws '41 extendingthrough the vertically extending portions 41 of the U-shaped brackets 42which are mounted upon the members 11 in any. suitable manner as bymeans of the bolts 43 which pass through the ears 44 on the members 42and through openings in the strap or p? ate member 45 engaging thelower,

flange of the channelled frame member 11. The block 39 is substantiallyrectangular and 5 is slidable within the U-shaped member 42 lengthwisethereof through a limited dis-- tance, and accordingly can be adjustedwithin certain limits by means of the set screws 40, this adjustmentbeing provided to take up'slack in the sprocket chain 36. If there ismore slack in the chain than can be taken 'care of in this manner, alink is removed therefrom in the usual manner.

Mounted on the shaft 38 so as to rotate therewith preferably by means ofthe elongated key member 46, are the rotatable tamping elements 47. Eachof said elements is provided with a series of ground engagingprojections or teeth which are in theform of truncated pyramids and.which jections on one member 47 being sta gered relative to theprojections on the a jacent member '47. The projections on one set ofsaid members-which align transversely are 1 4 The frame isfurtherprovided with the intermediate projections 48 and jections on anotherset of said members which align with each other but not' with theprojections of the previously mentioned set are indicated by the numeral49. Thus the 49 are staggered relative to each other. Furthermore inorder to prevent the meshing of the projections with the recesses madeby preceding tamping members when 'a succeeding tamping member goes overthe same ground, the tamping members are preferably made of twodifferent shapes. Thus, for example, the tamping members at the right ofFig. 4 which are indicated by the numerals '48 and 49' respectively arewider and shorter circumferentially of the members 47 than the projections 48 and 49. Each of the members 47 is, of course, provided withthe usual spokes 50 and a hub portion 51 through which the keymember 46passes, and one member 47 on each end of the shaft is mounted betweenthe end of the shaft and one of the sprockets 37 thus obtaining agreater width l for the tamping means. It is, of course, .un-

derstood that the key openings or ways in the members 47 are suitablyarranged so as to stagger the projections andmaintain the same in properstaggered relation at all times. 1

Y Extending between the transversely extendingmember 26 and therear'cros's member15 are the bars 52 having angular end portions 53secured to the members 26 and 15, said members '52 extending between-themembers. 47 and acting to scrape -ofi. or remove the earth from theteeth or projec tions on said member 47. A mud guard member 54 is alsopreferably provided whichextends from the member 26 through fsubstantially a quadrant and is secured at its upper end to theframework .by means of the diagonally extending braces 55.

In operation, a plurality of the tampingdevices is utilized, thesefollowing eac'h'other along the roadway to accomplish thetamping action.The first of said membersj'will,

of course, make recesses in the earth that is being tamped and in orderto avoid the entering of said recesses by the projections on thesucceeding tamping member, the succeeding tamping member s operated sothat the projections 48f and 49', thereon will align with the recessesmade in the surface of t 49, and as the projections 48' and 49 are of adifferent share than the projections 48 and 49, these will not merelysink into the recesses but will furthermore carry out the tamping actionbegun by the projections on" the preceding members. Thenext, followingtamping machine will be operated -so Y that the project-ions 48 and49'thereon will align with the recesses made by the projec tions 48' 49'of the second member and roadway by meansof the'projections 48 and soon, so that no corresponding projections will be following each other inrolling the members over the roadway.

Obviously it is immaterial in carrying out.

, .5 this method whether or not all the projecitions on a rotatablemember are of the same size or of different sizes or just how theprojections of the different, sizes are arranged \on the rotatablemembers, as long as the 10 projections of one circular series on onemember 47 will be followedin ro 'ng over thesurfade by a member 47 thathas projections of a different shape thereon, so that 'the projectionswill not merely mesh with the recesses in the roadway but will performtheir tamping function in a similar manner to which the first rollingmember with the projections thereon performed its tampingfunction.

What I claim and desire to secure by Letters Patent is:

1. In a device of the character described, a framework, a rotatableshaft mounted on the framework, and tamping and kneading means mountedon said shaft to rotate there ,with, and. comprising setsofmembers,.,the members of one set having contactsurfaces differing fromthose of the other set for the purpose set forth. 2. In a device of thecharacter described, a framework, a shaft mounted for rotation Athereon, and rotatable tamping. and lmead ing means mounted onsaid'shaft to rotate therewith, saidtamping and kneading meanscomprising a plurality of circular-series of projecting members, saidprojectin members of adjacent series being-arrange in staggered relationand the end facesof said projectin members of certain of said seriesbeing 0 different shape than the end faces of projecting members ofother of said series. J

' 3. In a device of the character described,

a framework, a shaft mounted for rotation thereon, and rotatable tampingand kneading means mounted on said shaft to rotate therewith, saidtamping; and kneading means comprising a plurality of projecting membersof different shapes arranged in staggered relation.

I 4. The method of tamping and kneading having roller associated with"the frame,

a surface comprising the rolling of a member having a series ofprojections thereon oversaid surface,'and then rolling said surface witha memberhaving a series of different projections. I

5. The method of tamping and kneading a surface comprising the rollingof a mem-. her having a series of projections thereon over said surfaceand then rolling a-membe'r a series of projections of a different shapeover the same surface.

6. The method of tamping and kneading v I a surface. comprisingthealternate rolling of members having projections of: different shapesthereon over said surface. I

7. A tamping machine, comprising a frame, a ground engaging: steeringwheelv associated with the frame, and a tamping havinga plurality'ofteeth arranged in overlapping, alternating rows, the teeth being in theform of truncated pyramids so that they will be equally effect ve whenthe machine is operating in either direction, and cleaning membersmounted between the rows of teeth. 1

8. A tamping machine, comprising a frame, a. ground engaging steeringwheel associated with the frame, a rotatable shaft' j in the frame,tamping wheels fixed tojthew shaft, each wheel having ground engagingteeth, each tooth being in the form of a truncated yramid, the teeth onone wheel being in 'lme with the space between the teeth of an adjacentwheel, and means lo.- cated between the wheels for removing mud from theteeth on the wheels.

9. A tamping -I nachine,- comprising a' frame, a smooth, ground engagingsteering wheel associated with the frame, a rotatable shaft in theframe, tamping wheels fixed on the shaft havin abutting hub portions,pro-. vided with tee h in the form of truncated pyramids, the teeth onone wheel being always-maintained in line with the space be- 9 tween theteeth on an adjacent wheel, and bracing and cleaning bars, extendingtransversely betweensaid wheels below the hub portions thereof, said hubportions spacing said wheels. I

In testimony whereof ;I aflix my signature. CALVERT R. HUNT.

